1. Q: What is the typical end finish for pipes meant for welding, per ASME B16.25?
A: Beveled ends, with a specific bevel angle (usually 37.5°) and a root face (land) to facilitate proper groove welding.
3. Q: What does "HIC Test" stand for and when is it required?
A: Hydrogen-Induced Cracking Test. It's required for pipes in wet H2S service to ensure resistance to stepwise internal cracking caused by hydrogen absorption.
4. Q: What is the main alloying element added to create "Weathering Steel" used in structural pipes like ASTM A847?
A: A small amount of Copper (Cu), along with Chromium, Nickel, and Phosphorus. These form a stable, adherent rust patina that inhibits further corrosion.
5. Q: What is the key process difference between DSAW (Double Submerged Arc Welded) and SSAW (Spiral/Helical SAW) pipes?
A: DSAW has two longitudinal welds on a straight-seam pipe. SSAW has one continuous helical weld, allowing production of large diameters from narrower steel plates.
